American Society of Civil Engineers


Effect of Assuming a Logarithmic Flow Profile Near the Bottom on Computing Tide-Residual Sediment Transport


by Tjerk J. Zitman, (Delft University of Technology, Faculty of Civil Engineering, P.O.Box 5048,2600 GA Delft, The Netherlands E-mail: t.j.zitman@citg.tudelft.nl)

pp. 1-12, (doi:  http://dx.doi.org/10.1061/40855(214)100)

     Access full text
     Purchase Subscription
     Permissions for Reuse  

Document type: Conference Proceeding Paper
Part of: Coastal Dynamics 2005: State of the Practice
Abstract: A common assumption in modelling tidal flow in coastal areas is that in the vicinity of the bottom the vertical flow profile attains a logarithmic shape. Some consequences of this type of assumption are studied in the present paper. In a diagnostic setting, the tide-residual transport of sediment is depicted as a function of the thickness of the assumed log-layer. In this respect, the tide is schematised to a combination of the M2 and M4 constituents and the water depth is chosen in a range typical for the shoreface (10–25m). The computational results indicate that assuming a log-layer may lead to an error in the cross-shore transport in the order of 1% of the alongshore transport.


ASCE Subject Headings:
Sediment transport
Tidal currents
Velocity